Area Code 24 – Rio de Janeiro
The phone area code for Rio de Janeiro is 24 (international format +5524). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 24
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Rio de Janeiro
Geographic Coverage and Administrative Jurisdiction
The +55 24 area code is a geographic National Destination Code (NDC) assigned to the central-southern region of the state of Rio de Janeiro, Brazil. This code covers the historic city of Petrópolis, the mountainous Serra Fluminense region, and the Costa Verde, including municipalities such as Teresópolis, Nova Friburgo, Angra dos Reis, Resende, Volta Redonda, and Barra Mansa. Administratively, these cities fall under the jurisdiction of the Brazilian National Telecommunications Agency (ANATEL) and are served by regional fixed-line concessionaires.
Dialing Formats and Caller Instructions
For local callers within the same area code, the standard format is the eight-digit subscriber number, e.g., 3344-5566. When calling from another Brazilian state or from a mobile phone, you must dial the national trunk prefix 0, followed by the operator carrier code (e.g., 15 for Vivo, 21 for Embratel), then 24 and the eight-digit number: 0 XX 24 3344-5566. International callers should dial the Brazilian country code +55, then 24, followed by the eight-digit local number: +55 24 3344-5566. Note that the leading trunk prefix '0' is not used when dialing from abroad.
Numbering Plan and Overlay Considerations
Brazilian fixed-line numbers are always eight digits long. The area code 24 does not currently have an overlay code; however, ANATEL has implemented a national migration plan that may introduce new digits or codes in the future. For now, all fixed lines in this region share the same geographic code, and calls between municipalities within the 24 area are treated as local or regional calls, depending on the distance and operator's tariff plan.
Practical Guidance for Callers
- Local callers: Dial only the eight-digit number (e.g., 3344-5566).
- National long-distance: Dial 0 + carrier code + 24 + number (e.g., 0 15 24 3344-5566).
- International callers: Dial +55 24 followed by the eight-digit number (e.g., +55 24 3344-5566).
- Mobile to fixed: From a Brazilian mobile, you must include the area code even if you are in the same region: e.g., 24 3344-5566.
This area code is essential for businesses and residents in the mountainous and coastal areas of Rio de Janeiro state. Understanding the correct dialing format ensures seamless connectivity for both domestic and international communications.